Dual intake manifold



June 3, 1930. D. E. ANDERSON DUAL INTAKE MANIFOLD Filed Oct. 8, 1927 O OI Q Patented June 3, 1930 PATENT OFFICE DAVID E. ANDERSON, OF DETROIT,MICHIGAN DUAL INTAKE MANIFOLD Application filed October 8, 1927. SerialNo. 224,962.

The invention relates to manifolds for internal combustion engines andmore particularly to intake manifolds designed to supply explosivemixture to the intake ports of multicylinder engines.

these engines the firing order is such that the charges in two adjoiningcylinders are fired successively. If a single branch of the intakeconduitsupplies mixture to these successively firing cylinders, as isusually the case, there is a tendency to unequal distribution of thecharge or of its constituents to the cylinders which draw their chargesfrom the same branch. The principal object of i 1 theinvention is toprovide means whereby 90 crankshaft is employed. The arrangementof thecranks 1n such manner that crank-.

. pins 1 and 4 are on opposite sides of the axis, and crankpins 2 and 3also opposite but at 90 from pins 1 and 4 results in a firing order inwhich, at least once in every complete engine cycle, two adjacentcylinders in one block fire successively. Such an arrz-ingement ofcranks andoneof the possible firing orders therefor are disclosed inBalancing of Engines, Sharp, 1907, p. 117-118. Various other firingorders are possible, of course, one of which is referred to herein. 1

In the accompanying drawings illustrating the application of theinvention to an engine of the above-mentioned eight-cylinder type, Fig.1 is a plan view, partly in section, representing the intake system.

Fig. 2 is a partial vertical section on line 22 of Fig. 1. I

Fig. 3 is a view similar to Fig. 1- but showing a modified arrangementof intake. passages, and

Fig. 4 is a similar fragmentary view of another modification.

Referring to the drawings, 9 and 10 indicate the blocks of aneight-cylinder V-engine, each block containing four cylinders. The

cylinder openings are indicated by numerals In certain types of 1 to 8,respectively, the arrangement of the numerals serving also to indicatethe firing 0rder, i. e., the cylinder indicated by 1 fires first, thenthe one indicated by 2, and so on. With the arrangement illustrated itwill be noted that cylinders 7 and 8 are adjacent.

Intake valve chambers are indicated at 11 and exhaust valve chambers at12. Commuv nication between these chambers and the combustion chambersordinarily formed in the heads ofthe cylinder blocks is controlled byvalves in the usual manner. Separate intake ports are provided for eachcylinder so that the sucessively firing adjacent cylinders are notrequired to draw their charges from a common valve chamber.

In order also to provide separate conduits from the vicinity of thecarburetor to the valve ports the intake manifold is formed in a doublesystem of passages indicated respectively by A and B.- The system Acomprises a transverse passage 13 communicating at its ends respectivelywith longitudinal branches 14 and 15. The branch 14 is connected to theintake ports of cylinders 5 and 7 and branch 15 to the ports ofcylinders 1 and 3. ,The system B comprises similarly a transversepassage 16 communicating at its ends respectively with branches 17 and18, branch 17 being connected to the ports of cylinders 4 and 6 whilebranch 18 is connected to the ports of cylinders 2 and 8. The transversepassages 13 and 16 may be formed integrally with a common wall 19 andare both be seen that cylinders 1, 3, 5 and 7 draw their charges fromsystem A while cylinders 2, 4, 6 and 8 are supplied by system B. Thus notwo successively firing cylinders draw from the same valve chamber norfrom the same manifold branch nor. even from the same system. In otherwords, each Cylinder draws its charge from the riser immediately abovethe carbureter without being affected, during the flow from that pointto. the intake port,

by reason of the suction from or flow to any verse conduit 32 of thesystem A',is connected other cylinder, or the ramming effect due to flowto a. previously opened port. This arrangement is therefore highlyconducive to uniform distribution. I

In the form shown in Fig. 3 the twomanifold systems, indicated as A',and B, are wholly separateand are connected respectively to separatecarbureters 30, 31. The transto a branch 33 supplyingcylinders 2 and 8while transverse conduit 34 of system B, is connected to a branch 35supplying cylinders 5 and 7. The connections at the other engine blockwill be reversed; of course, as in Fig. 1, the conduit 32 supplying theintermediate cylinders and conduit 34 of the endcylinders.

Fig. 4 shows an arrangement similar to that shown in Fig. 3 except thatthe conduits 42, 44, correspond to conduits 3 2, 34 of Fig. 3 are here'shown as returning to a common transverse plane so as to equalize thedistances from the carbureter to the respective ports. In-

this form again, the conduit 44 is connected at one end to a branch 45feeding the end cyl- 'inders and at the other to a branch 46 feeding theintermediate cylinders while conduit 42 is connected at one end tobranch 43 feeding the cylinders intermediate those supplied by branch 45and at the other to branch 47 feeding the end cylinders of the otherblock. I

Various other modifications in details may be made and therefore I donot wish to be restricted to the specific form's herein described exceptas required by the language of the "claims in view of the prior art:-

2. The combination with an eight-cylinder V-engine of the type in whichtwo cylinders 'termediate cylinders.

"at one end of one block fire in immediate sucand carbureting meanstherefor, of manifolding means comprising two systems of passages, eachsystem arranged to supply fuel mixture to the end cylinders-of oneblockand i the intermediate cylinders of the other block.

5." The combination with an internal combustion eight cylinder V enginehaving the cylinders whose firing-orders are 1, 3, 4 and 6 in one blockand those whose firing orders are 2, 5, 7 and 8 in the other block ofmanifolding means comprising two systems ofpassages, one system arrangedto supply fuel mixture to the cylinders whose firing order is 1, 3, 5

and 7 and the other system supplying the cylinder whose firing order is2, 4, 6 and 8.

6. The combination with an internal combustion eight cylinder V enginehaving four cylinders in each block and having a firing order such thattwo adjacent end cylinders in one block fire in immediate succession ofmanifolding means comprising two systems of passages each supplyingmixture to four of said cylinders, one of said adjacent cylindersreceiving fuel mixture from one of said systems and the other cylinderreceiving mix- I tore from the other system; 7

In testimony whereof I affixnry signature.

DAVID, E. ANDERSON.

cession and carbureting means therefor of manifolding means includingone manifold branch supplying the end cylinders of the I block andanother branch supplying the in- 3. Structure as set forth in claim 2,the

manifolding means including two systems of passages, each systemsupplying the end cylinders of one block and the'inter'mediate cylindersof the other block. 4. The combination with an eight cylinder V-enginehaving fourcylinders each block

